Lighting channels on static mesh doesn't change correctly at runtime

If call SetLightingChannels in blueprint to set a static mesh's lighting channels at runtime, the mesh in the viewport seems can't update to the new lighting channel setting. 

A weird thing is, if call SetLightingChannels at BeginPlay, the lighting channel can be changed as expected.

1. Test content: [Link Removed]
2. Open test level L_SetLightingChannel.
3. Play, press F, the mesh's lighting channel has changed to lighting channel 2, but still can be lit by the light(Lighting Channel 0)
4. Eject(F8), change any setting on the mesh(like disable dynamic shadow), the mesh turns dark.
5. Stop simulation, open the blueprint, link event BeginPlay to FlipFlop
6. Play, press F several times, the mesh's lighting channel can be changed as expected.

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